feat(primitives): format stage progress with two decimal places

[shekhirin]

Otherwise, we show progress at high block numbers as 100%:

stage=Bodies checkpoint=18501436 progress=100.0%

---

fn main() {
    println!("{:.1}%", 100.0 * 18501436.0 / 18503608.0);
    println!("{:.2}%", 100.0 * 18501436.0 / 18503608.0);
}

100.0%
99.99%